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x+54=x+126
We simplify the equation to the form, which is simple to understand
x+54=x+126
We move all terms containing x to the left and all other terms to the right.
+1x-1x=+126-54
We simplify left and right side of the equation.
0x=+72
0=72
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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